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On the morning of Aug. 7, 1974, after months of
preparation and years of dreaming, a French daredevil named Philippe Petit
stepped into the sky above Lower Manhattan. For almost 45 minutes he ambled
back and forth on a metal cable strung between the towers of the World Trade
Center, a feat of illegal tightrope walking that, according to a New York
Police Department sergeant who recounted Mr. Petit’s act of physical
poetry in dry press-conference prose, would more aptly be described as danc=
ing. For many years after, Mr. Petit’s stunt w=
as a
cherished footnote in the annals of New York history, one of the touchstone=
s of
a crazy, awful, glittering era in the life of the city. The destruction of =
the
twin towers in the terrorist attacks of Sept. 11, 2001, revived the memory =
of
that earlier aesthetic assault on the buildings, which is now the subject o=
f “Man on Wire,” James Marsh=
8217;s
thorough, understated and altogether enthralling documentary. Wisely, Mr.
Marsh, who based his film on a book Mr. Petit published in 2002, never allu=
des
to Sept. 11. That would have been both distracting and redundant, since it&=
#8217;s
impossible, while watching a movie so intimate in its attention to the towe=
rs,
not to be haunted by thoughts of their fate.

(b)If the line of =
action (see
graphic above) of the tightrope walker’sweight vector(blue above) is just 2
inches to the left of axis of rotation(at his feet at wire), find the torque
about this axis due to his weight(128 lbs) and weight of the 40 ft. rod? (c=
) Find
angular acceleration (in both radians/s2 & degrees/s2=
sup>)
of both tightrope walker + rod due to torque in (b)? (d) Would the tightrope
walker have enough time to adjust his center of mass to remain stable on wi=
re?
Answers: (a) 133.33 slug ft2 (b)26.67 ft lb (c) 0.2 radians/s2 or
11.46 degrees/s2 (d) ________.